Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 166, Issue -, Pages 712-722Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.01.153
Keywords
Stratlingite; Sustainable cement; CO2 reduction; Calcium sulfoaluminate; High performance cement; Thermodynamic modeling
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Funding
- Incheon National University Research Grant
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The main objective of this study was to investigate the phase and strength development of calcium sulfoaluminate-belite (CSAB) cement pastes with different amounts of gypsum and water. Thermodynamic modeling and a series of experiments including X-ray diffraction (XRD), thermogravimetric analysis, isothermal calorimetry, and compressive strength tests were performed. Decreasing the mixing water increased the strength of CSAB pastes, but decreased the degree of hydration. Interpretation of the early age XRD results and thermodynamic modeling suggested the formation of a meta-stable phase from the hydration of belite, possibly C-(A)-S-H, which transformed into stratlingite at later ages only in the samples with high water content, likely due to easier diffusion of ions at higher w/c. Furthermore, the XRD results and thermodynamic modeling confirmed that the amount of gypsum controls the hydration of ye'elimite as well as belite in the CSAB cements. (C) 2018 Elsevier Ltd. All rights reserved.
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